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This project is a functional simulator of Windows Longhorn (the canceled development build of Windows Vista, circa 2003–2005). It recreates the visual style, sidebar, WinFS-inspired elements, and early Aero effects that defined Longhorn’s ambitious but unfinished vision.

is the most popular and stable for simulation as it includes early versions of the "Aero" interface and the Sidebar. VM Configuration

As we move through 2025, the simulator work faces a new challenge: hypervisor deprecation. Newer versions of VMware (v17+) and VirtualBox (v7.1+) have removed support for legacy PCI bridges and VESA BIOS extensions that Longhorn's boot GPU driver requires.